Antminer S19 hash board U1 and U2 level converter chip
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When repairing the Antminer S19 hash board, if the voltage of all ASIC chips is normal, but the hash board cannot be recognized by the control board, it may be that the level conversion chips at U1 and U2 are faulty. The U1 chip is used to convert the voltage of the RI signal, and the U2 chip is used to convert the voltage of the CI signal. Only when these two chips are working normally, the control board and the hash board can communicate normally.
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